PPC64: jfr profiling doesn't work (PPC64 only)

[Lindenmaier, Goetz]

Hi Gunter, 

thanks for fixing these issues.

frame_ppc.cpp:
I think instead of JavaThread::stack_red_zone_size() + JavaThread::stack_yellow_zone_size()
you should use  JavaThread::stack_red_zone_size() + JavaThread::stack_yellow_reserved_zone_size()

Minor stuff:
Please add RFR(S): <bugid> to the Subject of your mail. 
Also, ususally the bug title is prefixed with [ppc].

Please remove redundant spaces from code like 
  address   sp = (address)_sp;
 (fp <= thread->stack_base()) &&  (fp > sp)
as well as double newlines.

No space before ) please:
  if (_cb != NULL ) {

Also please break some of the comments to shorter 
lines.

thread_linux_ppc.cpp
also just minor stuff:
  Please fix indentations.  Please indent by two with spaces, no tabs.

  There is an empty if (ProfileInterpreter) { }. Why?

I can sponsor this for you.

Best regards,
  Goetz.


> -----Original Message-----
> From: hotspot-runtime-dev [mailto:hotspot-runtime-dev-
> bounces at openjdk.java.net] On Behalf Of Haug, Gunter
> Sent: Donnerstag, 19. Juli 2018 12:53
> To: hotspot-runtime-dev at openjdk.java.net
> Subject: [CAUTION] PPC64: jfr profiling doesn't work (PPC64 only)
> 
> Hi all,
> 
> can I please have reviews and a sponsor for the following fix:
> 
> https://bugs.openjdk.java.net/projects/JDK/issues/JDK-
> 8207392?filter=allopenissues
> http://cr.openjdk.java.net/~ghaug/webrevs/8207392/
> 
> JFR profiling on linux PPC64 has not been implemented correctly so far, the
> VM crashes when it is turned on. Therefore
> hotspot/jtreg/runtime/appcds/TestWithProfiler.java fails. With this fix the
> test succeeds. I've analyzed a couple of benchmarks with JMC and results
> look plausible when compared to linux x86.
> 
> Thanks and best regards,
> Gunter
> 
> 
> 
>